Lethargic Crab
Sorry to tell you, but he is either dying slowly, or atempting to shed his exo, mine shed theres liek this all the time, so just keep it dark, quiet and humid, nothing more you can really do. dont mist him or anything though. Leave him be with those conditions
Currently No Hermit Crabs until I am out of college, but I have over 5 years of crabbing experience, and much advice to offer 

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Topic author
I don't think it is post purchase stress because the crab was happy and healthy for 2 months. Then all of a sudden it hit. If it is shedding its exoskeleton shouldn't it be buried? Why shouldn't I mist the crab? I've been misting the tank, which gets the crab wet. How will I know if the crab is dead? It is getting hard to tell at this point. I don't want to wait to the point where it starts to smell horrible.
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Topic author
Ideally he would be buried but some crabs do surface molts for whatever reason. I just had one molt and he was a bit on the surface so I took a small cardboard box (like what jewelry would come in), cut off one small side and gently placed the box on him so he would have darkness and wouldn't get bothered by anyone wandering on him.
I hope your crabbie makes it!
I hope your crabbie makes it!